ParallelExecutor.h

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#ifndef SimTK_SimTKCOMMON_PARALLEL_EXECUTOR_H_
#define SimTK_SimTKCOMMON_PARALLEL_EXECUTOR_H_

/* -------------------------------------------------------------------------- *
 *                       Simbody(tm): SimTKcommon                             *
 * -------------------------------------------------------------------------- *
 * This is part of the SimTK biosimulation toolkit originating from           *
 * Simbios, the NIH National Center for Physics-Based Simulation of           *
 * Biological Structures at Stanford, funded under the NIH Roadmap for        *
 * Medical Research, grant U54 GM072970. See https://simtk.org/home/simbody.  *
 *                                                                            *
 * Portions copyright (c) 2008-12 Stanford University and the Authors.        *
 * Authors: Peter Eastman                                                     *
 * Contributors:                                                              *
 *                                                                            *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may    *
 * not use this file except in compliance with the License. You may obtain a  *
 * copy of the License at http://www.apache.org/licenses/LICENSE-2.0.         *
 *                                                                            *
 * Unless required by applicable law or agreed to in writing, software        *
 * distributed under the License is distributed on an "AS IS" BASIS,          *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   *
 * See the License for the specific language governing permissions and        *
 * limitations under the License.                                             *
 * -------------------------------------------------------------------------- */

#include "PrivateImplementation.h"
#include <thread>
#include <iostream>
 
namespace SimTK {

class ParallelExecutor;
class ParallelExecutorImpl;

// We only want the template instantiation to occur once. This symbol is defined in the SimTK core
// compilation unit that defines the ParallelExecutor class but should not be defined any other time.

//TODO: Rewrite the threading class using C++11 std::thread

#ifndef SimTK_SIMTKCOMMON_DEFINING_PARALLEL_EXECUTOR
    extern template class PIMPLHandle<ParallelExecutor, ParallelExecutorImpl>;
#endif

class SimTK_SimTKCOMMON_EXPORT ParallelExecutor : public PIMPLHandle<ParallelExecutor, ParallelExecutorImpl> {
public:
    class Task;
    explicit ParallelExecutor();
    explicit ParallelExecutor(int maxThreads);
    ParallelExecutor* clone() const;
    void execute(Task& task, int times);
    static int getNumProcessors();
    static bool isWorkerThread();
    int getMaxThreads() const;
};

class ParallelExecutor::Task {
public:
    virtual ~Task() {
    }
    virtual void execute(int index) = 0;
    virtual void initialize() {
    }
    virtual void finish() {
    }
};

} // namespace SimTK

#endif // SimTK_SimTKCOMMON_PARALLEL_EXECUTOR_H_